Note 3 - Stock-based Compensation - Stock-based Compensation Plan Expenses (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share based compensation expense		$ 31,572	$ 22,975	$ 92,282	$ 62,581
Tax benefit related to stock-based compensation	[1]	488	512	1,299	1,450
Cost of Sales [Member]
Share based compensation expense		922	707	2,622	1,906
Research and Development Expense [Member]
Share based compensation expense		6,646	5,334	19,564	14,666
Selling, General and Administrative Expenses [Member]
Share based compensation expense		$ 24,004	$ 16,934	$ 70,096	$ 46,009

[1] Amount reflects the tax benefit related to stock-based compensation recorded for equity awards that are expected to generate tax deductions when they vest in future periods.